Mine was $10 from LITEmania a couple months ago. They had been done by goldserve according to Warren. I had seen them on his site, but not his Dealers Corner thread. I also got a couple from goldserve, but I believe he is out.
If you want to do the mod yourself, you can also search on www.digikey.com for 529PB-ND. That part number is a switch which is the same size as the Q3 but it has double output contacts so that one can be set up to go through a resistor (there are threads with pics showing the mod.) The part is less than $2, but the shipping will be more than that.